<template>
    <div>
        <!--面包屑导航区域-->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item :to="{path:'/goods'}">商品列表</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图区域-->
        <el-card>
            <!--提示区域-->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!--步骤条 :active默认在第几个步骤  finish-status完成后的颜色-->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!--tab栏区域-->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave"
                         @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="cateProps"
                                         @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!--渲染表单的item项-->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                                      :key="item.arrt_id">
                            <!--复选框组-->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!--上传图片 action图片要上传到的后台api地址-->
                        <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove"
                                   list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!--富文本编辑器组件-->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!--添加商品按钮-->
                        <el-button class="btnAdd" type="primary" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
            <!--图片预览-->
            <el-dialog title="图片预览" :visible.sync="previewVisible" width="60%">
                <img :src="previewPath" class="previewimg">
            </el-dialog>
        </el-card>
    </div>
</template>

<script>
    import _ from 'lodash'

    export default {
        name: "Add",
        data() {
            return {
                activeIndex: '0',
                // 添加商品的表单数据对象
                addForm: {
                    goods_name: '',
                    goods_price: 0,
                    goods_weight: 0,
                    goods_number: 0,
                    // 商品所属的分类数组
                    goods_cat: [],
                    // 图片的数组
                    pics: [],
                    // 商品的详情描述
                    goods_introduce: '',
                    attrs: []
                },
                // 表单验证规则
                addFormRules: {
                    goods_name: [{
                        required: true,
                        message: '请输入商品名称',
                        trigger: 'blur'
                    }],
                    goods_price: [{
                        required: true,
                        message: '请输入商品价格',
                        trigger: 'blur'
                    }],
                    goods_weight: [{
                        required: true,
                        message: '请输入商品重量',
                        trigger: 'blur'
                    }],
                    goods_number: [{
                        required: true,
                        message: '请输入商品数量',
                        trigger: 'blur'
                    }],
                    goods_cat: [{
                        required: true,
                        message: '请选择商品分类',
                        trigger: 'blur'
                    }]
                },
                // 商品分类列表
                catelist: [],
                // 级联选择器配置对象
                cateProps: {
                    label: 'cat_name',
                    value: 'cat_id',
                    children: 'children',
                    expandTrigger: 'hover'
                },
                // 动态参数列表数据
                manyTableData: [],
                // 静态属性列表数组
                onlyTableData: [],
                // 上传图片的URL地址
                uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
                // 图片上传组件的headers请求头对象
                headerObj: {
                    Authorization: window.sessionStorage.getItem('token')
                },
                previewPath: '',
                previewVisible: false
            }
        },
        created() {
            this.getCateList()
        },
        methods: {
            async getCateList() {
                const {data: res} = await this.$http.get('categories')
                if (res.meta.status !== 200) {
                    return this.$message.error('获取商品分类数据失败！')
                }
                this.catelist = res.data
            },
            // 级联选择器选中项变化触发
            handleChange() {
                if (this.addForm.goods_cat.length !== 3) {
                    this.addForm.goods_cat = []
                }
            },
            beforeTabLeave(activeName, oldActiveName) {
                if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                    this.$message.error('请先选择商品分类！')
                    return false
                }
            },
            async tabClicked() {
                if (this.activeIndex === '1') {
                    const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'many'}})
                    if (res.meta.status !== 200) {
                        return this.$message.error('获取动态参数列表失败！')
                    }
                    res.data.forEach(item => {
                        item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                    })
                    this.manyTableData = res.data
                } else if (this.activeIndex === '2') {
                    const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'only'}})
                    if (res.meta.status !== 200) {
                        return this.$message.error('获取静态属性失败！')
                    }
                    this.onlyTableData = res.data
                }
            },
            // 处理图片预览效果
            handlePreview(file) {
                this.previewPath = file.response.data.url
                this.previewVisible = true
            },
            // 处理移除图片的操作
            handleRemove(file) {
                // 1.获取将要删除的图片的临时路径
                const filePath = file.response.data.tmp_path
                // 2.从pics数组中，找到这个图片对应的索引值
                const i = this.addForm.pics.findIndex(x => x.pic === filePath)
                // 3.调用splice方法，把图片信息对象，从pics数组中移除
                this.addForm.pics.splice(i, 1)
            },
            // 监听图片上传成功的事件
            handleSuccess(response) {
                // 1.拼接得到一个图片信息对象
                const picInfo = {pic: response.data.tmp_path}
                // 2.将图片信息对象，push到pics数组中
                this.addForm.pics.push(picInfo)
            },
            // 添加商品
            add() {
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) return this.$message.error('请填写必要的表单项！');
                    // 执行添加
                    // lodash cloneDeep(Obj) 深拷贝组件
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',')
                    // 处理动态参数
                    this.manyTableData.forEach(item => {
                        const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')}
                        this.addForm.attrs.push(newInfo)
                    })
                    this.onlyTableData.forEach(item => {
                        const newInfo = {attr_id: item.attr_id, attr_vals: item.attr_vals}
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs
                    // 发起请求添加商品
                    // 商品的名称必须是唯一的
                    const {data: res} = await this.$http.post('goods', form)

                    if (res.meta.status !== 201){
                        return this.$message.error('添加商品失败！')
                    };

                    this.$message.success('添加商品成功！')
                    this.$router.push('/goods')
                })
            }
        },
        computed: {
            cateId() {
                if (this.addForm.goods_cat.length === 3) {
                    return this.addForm.goods_cat[2]
                }
                return null
            }
        }
    }
</script>

<style scoped>
    .el-checkbox {
        margin: 0 10px 10px 0 !important;
    }

    .previewimg {
        width: 100%;
    }

    .btnAdd {
        margin-top: 15px;
    }
</style>